<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <script src="./jquery.js"></script>
  </head>
  <style>

.s_type {
    border: none;
    border-radius: 5px;
    background-color: #f3f3f3;
    padding: 7px 0;
    color: #606266;
    margin: 5px 2.5% 5px 0;
    width: 30%;
    position: relative;
}


.select {
    background-color: #ebf3ff;
    color: #5999fc;
}

.select:before {
    content: '';
    position: absolute;
    right: 0;
    bottom: 0;
    border: 9px solid #5999fc;
    border-top-color: transparent;
    border-left-color: transparent;
}
.select:after {
    content: '';
    width: 2px;
    height: 5px;
    position: absolute;
    right: 3px;
    bottom: 5px;
    border: 1px solid #fff;
    border-top-color: transparent;
    border-left-color: transparent;
    transform: rotate(45deg);
}

  </style>
  <body>
    <button class="s_type select">2020年夏季</button>
  </body>
</html>
